/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.pulsar;

import org.apache.iotdb.rpc.IoTDBConnectionException;
import org.apache.iotdb.rpc.StatementExecutionException;
import org.apache.iotdb.session.pool.SessionPool;
import org.apache.iotdb.tsfile.file.metadata.enums.CompressionType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.pulsar.client.api.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class PulsarConsumer {
    private static final String SERVICE_URL = "pulsar://localhost:6650";
    // Specify the number of consumers
    private static final int CONSUMER_NUM = 3;
    private List<Consumer<?>> consumerList;
    private static SessionPool pool;
    private static final Logger logger = LoggerFactory.getLogger(PulsarConsumer.class);

    public PulsarConsumer(List<Consumer<?>> consumerList) {
        this.consumerList = consumerList;
    }

    public void consumeInParallel() throws ClassNotFoundException {
        ExecutorService executor = Executors.newFixedThreadPool(CONSUMER_NUM);
        for (int i = 0; i < consumerList.size(); i++) {
            PulsarConsumerThread consumerExecutor = new PulsarConsumerThread(consumerList.get(i), pool);
            executor.submit(consumerExecutor);
        }
    }

    @SuppressWarnings("squid:S2068")
    private static void initIoTDB() {
        try {
            for (String storageGroup : Constant.STORAGE_GROUP) {
                addStorageGroup(storageGroup);
            }
            for (String[] sql : Constant.CREATE_TIMESERIES) {
                createTimeseries(sql);
            }
        } catch (IoTDBConnectionException | StatementExecutionException e) {
            logger.error(e.getMessage());
        }
    }

    private static void addStorageGroup(String storageGroup)
            throws IoTDBConnectionException, StatementExecutionException {
        pool.setStorageGroup(storageGroup);
    }

    private static void createTimeseries(String[] sql)
            throws StatementExecutionException, IoTDBConnectionException {
        String timeseries = sql[0];
        TSDataType dataType = TSDataType.valueOf(sql[1]);
        TSEncoding encoding = TSEncoding.valueOf(sql[2]);
        CompressionType compressionType = CompressionType.valueOf(sql[3]);
        pool.createTimeseries(timeseries, dataType, encoding, compressionType);
    }

    public static void main(String[] args) throws PulsarClientException, ClassNotFoundException {
        PulsarClient client = PulsarClient.builder().serviceUrl(SERVICE_URL).build();

        List<Consumer<?>> consumerList = new ArrayList<>();
        for (int i = 0; i < CONSUMER_NUM; i++) {
            // In shared subscription mode, multiple consumers can attach to the same subscription
            // and message are delivered in a round robin distribution across consumers.
            Consumer<byte[]> consumer =
                    client
                            .newConsumer()
                            .topic(Constant.TOPIC_NAME)
                            .subscriptionName("shared-subscription")
                            .subscriptionType(SubscriptionType.Key_Shared)
                            .keySharedPolicy(KeySharedPolicy.autoSplitHashRange())
                            .subscribe();
            consumerList.add(consumer);
        }
        PulsarConsumer pulsarConsumer = new PulsarConsumer(consumerList);
        initIoTDB();
        pulsarConsumer.consumeInParallel();
    }
}
